I know I'm new to boat wireing.
I need help.
I have a C&C 30 mk1. The mast has a steamer light and 2 spreader lights. At the very top there is a coax and a transducer cable.
The spreader lights and the Steamer light are not hooked up? They were not hooked up when I purchased the boat.
The only thing is I dont know how to wire them . Thwew is a negitive buss onder the seat where the light could be hooked up but there is no positave buss? Do i hace to run a hot wire all the way back the the switch on the cabin wall?

Yes, you have to run the hot wire from the fuse panel. There is no positive buss-- if there were such a thing you'd need to wire a switch after the bus to a convenient spot anyway.
On my boat the negative buss is under the forward dinette cushion, to port of the mast step. There is a fuse panel above the galley sink which has a "steaming light" fused switch. Positive goes from there to a connector under the dinette. This connector is actually a "segmented" bus bar which allows multiple separately fused circuits to be connected in one location. This is convenient to have under the dinette so all 12V mast connections can be connected in one area. I also run my bilge pumps to that bus.
If you find a similar separated-circuit bus bar in your dinette, just test each circuit while you try switches at your fuse panel. I suspect that it's already wired but may be unused for whatever reason.

My last post was before you posted the photo. Yes, everything is there. The bus in your bottom photo is positive. Each screw should be a separate circuit. One of those wires on the left side of the bus is your steaming light. I can't remember which one and my wiring diagram is on the boat, but just put a voltmeter on each connector and hit your steaming light switch and you'll find it.
How is your mast wiring? If you need to replace it, I'd recommend putting conduit in the mast. The absence of wires slapping around inside the mast is worth the work.

So run one wire to the correct buss for the switch. then use a but connector and run a new wire back to the other pole on the same switch?
Sounds simple enough. I wonder why the wires are not there now?

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